The protractor (3) with a triangular rule is arranged on a board and is fixed on the two sides on the upper part of the compasses through an elastic fixing clip (7).
板面上带有三角尺的量角器(3)通过弹性固定卡(7)固定在圆规的上部两侧。
Importing the geometry character of the triangular mode by the right-hand rule;
对圆形区域法进行改进，以右手螺旋法则构造三角形模式的几何特征；
Importing the geometry character of the triangular mode by the right-hand rule;
对圆形区域法进行改进，以右手螺旋法则构造三角形模式的几何特征；
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